Russia's Andrey Rublev said "it is impossible to explain" after defeating Roger Federer in the third round of the Cincinnati Open on Thursday. The Russian qualifier beat 20-time Grand slam champion 6-3, 6-4 and hailed the former world number one as a "true legend".

'It is impossible to explain, he is a true legend,' says Rublev after defeating Federer

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'It is impossible to explain, he is a true legend,' says Rublev after defeating Federer